Current-testing device for electric batteries.



W. C. HOOD. Y CURRENT TESTING DEVICE POB ELEGTBIOBATTEBIES, APPLIUATIONFILED 1213.20, 190s.

Patented A115110, l190;), v i

-W. 0. HOOD. CURRENT TESTING DEVICE EOE ELECTRIC BATTERIES.

v APPLICATION FILED 20, 1908.

930,474. Patented Aug. 1o, 1909.

197. 07 ,..az ..woa 0340/175.:

l2 AMAS/vm.

/ AMPERES /8 AM PERES l 7T T2 775572655625" I 206785971 Mgfyj/ lWZ'ZZZ'QWZ 617000Z for-.anamin'etei' for ascertaining at any timevdiecnrreiit arnished,or which can befurdry cells'7` though not limitedto such use.VA

.,S .is aplan `viefiv of ya Vdevice in Shapefand specification,.-Areference being yhadl `to the dravvzings. forming a part thereof.

andhereinafterf described, as' indicated in yvenientl forni for.`application to common -fornis of cylindricaldry cells. Fig. 2 1s "vationofa dry cell having the inclosing' WILLIAM c; Hoon, oF CHICAGO,"ILLINQIS',

JASSIGNOR.or` ONE-HALF "roeiiAiiLES i i DIETRICH, QF CHICAGO, ILLINOIS.-A

CURRENT-TESTING DEVICE vFor. ELEcTnIdnAfrEntesi d Y No. 930,474..

To ,allai/10m it may concern:

Befitlinown. thatfl, lVii-.LL-iir Hoon, a, citizen of the United States,residing at- Chicago, yin the lcounty of Cook and State of'Illinoia,haveinvented new. and useful Improvements in GurrentfTesting Devices forElectric Batteriesofwhich the following is a The .purposeot' thisinvention 1s to provide a cheap,l simple and easily applied substituteiiished,u byv an electricbatteiy or cell;y and it isintended;particularly for application to The inyentonconsists ot adevice having the characteristics shown in the `dran-'ings thegclaims. c4

In the drawings:eFigure l is a plan view. ofa deviceA embodying myinvention, of cona section at thejline 2 -2 on Fig. l. YFig. is a planview .of.a slightly modified forni of the device suitable forapplication to isa-plan .vieivfofa third form ot' the device adaptedfona cell or battery of different slmpeandv construction. Fig. 5 is anelepasteboirdv envelop. provided vvith devices einbo dving. 4my4invention. Figs. 6 and' 7 are .plan views of cards adapted to beass'em# bled in books provided with thefeatures andelement-sj;'-constitnting my i nveiition.-v Fig.l

formVV lpte/d to beA applied toa cell of theA` eal'nefnrl as tlietlevice,shown in Fig. l, buti havbngwfznmodified construction in respectSVother than its'mere form for fitting there-lh f a section at tlieliiie9-9 outer face of the l 'disk orplate, A, of t1 The variations inthickness `fare;{notf reprevarying in tliickxie'ss",` or 'acc l oneuponyanotlier in varying-n inbers; across E f is extended across Atheaperta e1* below eighteen ainp'eres: Bai-.applying i l Widths may?betf-'siniilarli specificati@ metiers recent; A i Patented Aug. 1o,` 19o91 A4 A'ppucup mediana 2q, isos. seriai m5422211.' "7 Y .Bij-agir or.thickness.' f

sented in .the drawings;because-the actual. variations would'be.in'appicfable,l 'anj'd for 2610' `the samereason stripsvaryingiin ytliizkileSQS A; are not `so j convenient forft'he'iirpose be; cause. notso readily di'stingui'slia le as st'rigsff 'Y .varying in Width.-Neviertheless'itwill "secu that the principle fioperationvvlld"*'65 beunchangedand OiilvrtlietOi ience'ffof the t device affected by`emplofving'c Strips j the ldifferent rows ofholes."'lhejcijo's's-secgf7'0` tions of the dilierentjstrips','Whether vaiylj'ingv in thickness or width', are suchthatthe'- severalfrstrips maybe'finelted `'j tnfssi'ng through them across thev apertures corre-fspondingl7 varying electric" currents. The .'75

nai'roivT strip, B', for-example mayV be of: 1

such cross lSect-ion thatu'pon'tthe application to vit, vat oppositesidesfof j any `n'e of the 'i apertiires over which it: is i'laidfof thetwoV rent of three' ampres melted'under similar circiimstansff'by 'a'f"be still wider or tliicker,'='-requiring:eighteen 'iest strip,y B4.A zIfgit doeilnotniel't- "chest-rip'f 95 i" at. 'the aperture at.'theraopposite sides .or which the Wires are appliedwtlie eurrenti.

that v are 'i interdire 'i to the space available ,forthe pnrposepn i.

disk of convenient size for application to the 1197;

particular cellA for which it was intended. The 'numberchosenl forillustration is of `coursenot significant. The purpose ot arrangingeacli strip of uniform width to extend across a plurality ot' aperturesis to make it possible to test` tlieisaine cell several times during thetime that its lstrength is between theA limits'of resistance of each twoconsecutive strips.

Theditl'erence Vbetween the forms shown in F igs.. 1,.3 andV 4 is onlymechanical, each of these forms.being,in respect to shape and vpositionof the apertures, adapted for securing it to a particular form of cell.vAs a matter of practical convenience it is desirp able that the deviceshould be attached to the inodated by cutting away ai segment of 'thedisk, as'at theline 2 on Fig. l. When the carbon` element of the cellis-extended out through the cap at the center, the' form shown in Fig. 3is more convenient, the oblong aperture, 3, at the center being designedto accommodate the carbon, while the aperture, et, affords means forsecuring the .disk to the binding' screwl connected with the otherelement of the cell. The form of the device shown in Fig. l is adaptedfor a familiar formof liquid cell, the aperture, 5,

being designed to admit the zinc element, the device being secured bythe binding screw on the carbon element taking through the aperture.

In Fig. 5 the pasteboard sheath, D, which is commonly applied in aspiralform to inclose familiar types of dry cells is utilized for the sainepurpose as the dis shown in the previous ligures, the apertures, nl,being formed in convenient rows, and crossed by the tin-foil strips, B,B1, B2, B3, Bt, precisely as in the case of the disks so as to be usedin testing a cell in tlie'saine manner as above described.

Instead of a plurality of strips of different width or thickness, theremay be ein- -plo ed tapered strips, as shown in Fig. G.

This ligurek represents a testing card, M, which is shown without regardto the means of applying it or securing it to a cell, this not beingnecessary, but only a convenient, incident ofl the construction or use,the tapered strips, E, being extended each across a row of holes, m, inthe card. The only reason for providing a plurality of tapered stripsand a plurality of rows of holes across which they extend is to ati'ordconvenience or makin 1r more than one test at the same strength o thebattery.

In'one forni of the`invcntion having convenience for certain purposes,testing cards, M or N, are each provided with apertures, m, n', crossedby strips of tin-foil, eitheryoi diil'erent widths, as in the forni oidevice in Fig. l, or tapered strips as in i"ig. (i. A number oi thesecards being assembled in a book provide means for one having occasion tomake frequent tests, to do so readily and keep a record opposite each ofthe apertures of the/particular cell or battery tested.

Jn Figs. EL and 9 there is shown a modification of the invention inwhich, by employing` a base which is substantially perfectly ins`lating, the apertures may be dispensed the base, F, in this constructionmay be t ken to be mica, glass, hai-d rubber or other substantiallyperfect,y insulator. ysing a card of such material as liber board,strawboard or the like, which is of comparatively high insulating power,and securing the tin-foil strips to such base by a sufficiently thicklayer of rubber cement or other insulating cement which when hardenedconstitutes the real base on which the tin-foil i'ests, the saine effectis produced as by employing a perfectly insulating base; and theconstruction shown in Figs. 8 and 9 may be understood as including sucha structure. The cominoii forms of rubber cement applied to pasteboard,for example, will saturate the pasteboard for a suiicient depth, sothat, including the layer of cement remaining on the surface of thepasteboard' in addition to that which penetrates it, the resultingcomposite structure, consisting of pasteboard and cement, will berenderedv practically a perfect insulator.

1. A battery currenttesting device consisting of an insulating supportand metal foil mounted thereon of graduated widths at ditferentpoints.

2. A batterycurrent-testing device consisting of an insulating basehaving rows of apertures and inetalfoil extending acrossthe apertureshaving different widths at dif- 'erent apertures.

3. A battery currenttesting device conlsis-ting of an insulating basehaving a multiplic'ity of apertures, and metal foil applied to the basebridging the apertures, the width of thefoil heilig different atdifferent apertures. 4

4. A battery current-testing device consisting of an insulating base anda plurality of insulated strips ofmetal foil of graduated widths mounteddirectly thereon.

A battery current-testing device consisting of a supporting base and aplurality llO of insulated strips of metal foil. of graduated p widthsmounted thereon.

G. A battery current testing device coii- 1 strips Tof graduated widthsmountedon the base 'entendingacross the .apertures of therespective'rows.

MT. A batteryfcurrent -testing device lcon,- sistingof a disk ofinsulating 'substance aperturedfor securing' to one of the -batterybinding posts, and having' mounted- Y oil having upon its exposedsurface metal vgraduated widths.

, 8. A battery.-current--testing'device cen'`4 sisting ,ofa disk ofinsulat1ng`-'Inaterial apertured for attachment to one ofl the bat-yterybinding posts, such Vdiskhaving aplurality of apertures, and metalfoil of gfrad-- y set myuated Widths secured to 'the' disk'bridging suchapertures.4 l l l 9. A battery-current-testingdevice ada ted forcylindrical dry cells consistingo a circular diskcorrespndingfindiameter to tli'e end of the cell apertured orsecurement'to one of the battery binding posts having;

another aperture to admit the other binding 'adapted ,tm

"postorbattery'I pole, and having mounted upon lts'exposed face' apluralityofmetal foil strips of graduated Widths.

v10g-*AI battery current-testing device for dry cell's consisting of adisk of insulating' material corresponding""t0A the dimensions ofthe'end of the"` delhi-having yal'ierttues for posts oi' batterypoles-and' the f .bin l secured to one of the binding posts at Xsuchaperture, such4 hav-nV rows of other apertures, and |I netal `lfoil'ilograduated Svidths' secured to ythe exposed Inthe presence mi;`

' JULIA- S. A336131',

ML Any.

